Bell-ringing circuit.



m 837,635. PATENTED DEL; 1906.

e. P. MoDONNELL. BELL ameme omcnn.

APYLIOATION-PILED NOV. 20. 1905.

2 SHEETSSHBET 1.

No. 837,635. PATENTED DEC. 4, 1906.

G. P. MQDONNELL.

BELL RINGING CIRCUIT.

APPLICATION FILED 11017.20. 1905.

Wihnasses Inventor: I Qg/m @ew&% George P. M Donnell NELL,

at St. L

. being had to the accom sectional view on the line 2 UN TED STATESPATENT GEORGE P. Mcnc'NNELL, or

FFICE.

ST. LOUIS, MISSOURI, ASSIGNOR TO AMERICAN ELECTRIC COMPANY, OF EASTORANGE, NEW JER- SEY, =A CORPORATION OF NEW JERSE Y.

BELL-RINGiNG CIRCUIT.

Specification of Letters Patent.

- Patented Dec. 4, 1906.

Application filed llovember 20, 1905. Serial No. 288,220.

, RingingOircuits, of which the following is a v 7 full, clear, andexact description, such as will I enable others skilled in the art towhich it appertains to make .and use the same, reference anyingdrawings, forming part of this spec cation, in which Figure 1 is adiagrammatic view of my improved bell-ringing circuit.

Fig. 3 is a diagrammatic view of a modified form of circuit.

This invention relates to a new and useful improvement in bell-ringingcircuits, the object. being to derive from the main-line circuit ofhigh-current strength a weaker bellringing circuit and to provide meanswherebyjtheweakness (or strength) of the derived circuit can beregulated according to the strengthof the main-line circuit or accordingto the amount of current required to ring the bell.

. With this object in view the invention consists in the construction,arrangement, and combination of the several parts, all as will behereinafter described and afterward pointed out in the claim.

My present invention is designed particularly as an improvement upon thecircuit-in terrupter shown in United States Patent No. 800,315, grantedto me September 26, 1905, wherein the interrupter-disk is mounted on thearmature-shaft of a motor and a resistance-coil is arranged in serieswith the interrupted bell-ringing circuit.

My present invention dispenses with the use of a motorand-interrupter-disk, and instead of making and breaking the circuit anddeenergizing the bell-magnets I supply a constant current oflow voltageand am thus enabled to use an ordinary bell-magnet whose armature isprovided with a current maker and breaker, as is wellunderstood.

. In the drawings, '1 and 2 indicate mainline wires of the electriccircuit, which we will assume is a circuit of high. voltage orconsiderable strength. Leadin'g'froin the wires of thiscircuit are wires3 and 4 to the ends of a resistance-bar 5. Interposed in the lengthsFig. 2 is a cross 2 of Fig, 1, and

of thewires 3 and 4 are fuses 6, which for convenience may be thewell-known cartridgeiusesof commerce.

Assuming that the current is flowing through the wires 3 and 4 and theresistancebar 5 in the direction of the arrows, it will be obvious thatif the derived circuit is tapped from the resistance-bar close to thepoint of connection of wire 3 therewith, but'a small amount ofresistance will be cut in the derived circuit', and consequently thederived circuit will be one of relatively great strength or highvoltage.

circuit will be made proportionately weaker.

Slidingly mounted on the resistance-bar 5, which resistance-bar is'madeup of com osition including graphite, is a band or col ar 7, which maybe clamped in position at any desired point along the length. of the bar5. A

On the other hand, if the derived circuit is tapped from theresistancebar at a point where a portion of said resistance is 'cut insaid derived circuit said derived wire 8 leads from this clam 7 to thefixed binding-post 9, said wire 8 eing preferably coiled so as toaccommodate the movement of clamp 7 to itsdiiierent adjusted positions.From binding-post Q leads a wire 10, in the length of which is a switch11, wire 10 being connected to one of the binding-posts of an ordinaryelectric bell. From the other post of this electric bell leads a wire 12to a point Erhere the wire 4 connectsiwith the resistance- Theresistance-bar 5 and the fuse-cartridges 6 may be mounted on anysuitable insulationsupport and arranged in any convenient place. Whereit is desired to utilize the power-current of an electric railway toring the signal-bells of the car, it is only necessary to substitute myimproved resistance-bar and its attachments for the batteries nowusually employed and connect the proper terminals from the'bell-ringingcircuit to the adjustable collar 7 and the point of connection of wire 4to the end of the resistance-bar and make connection between the ends ofthe cartridge-fuse supports with the main-line circuit. Say that atwo-hundredandtwenty volt current was being employed as thepower-current and it required twenty volts to ring the bells. The clamp7 would be adjuste'dalong the bar 5 untilthe derived bell-ringingcircuit possessed the requisitestrength. By clamping the collar 7 on thel bar no further adjustment would. be necessary.

1n. the modification shown in Fig. 3 I have shown a number ofincandescent lamps in series as taking the place of the resistauccebar5, one leg of the derived circuit being connected at a proper pointbetween any two lamps in the series after having determined the strengthof the current desired in the derived circuit. Byhaving incandescentlamparranged in series, as shown, it is obvious that lamps of differentresistances can be employed, andv consequently varied degrees of currentstrength in the derived circuit can be obtained by tapping into the lineof the series of lamps or changing the resistance of the several lampsin the series.

The lamps above described act in the same Way as resistance-coils in. arheostat, and, in fact, if desired, an ordinary rheostat could be I usedin place of the bar or of the lamps and the derived circuit tapped intothe resistance at desired points to obtain the required strength in thederived circuit.

A switch a is preferably used in the primary circuit, so as. to make andbreak the same when desired. This sw'itcl'i i may be used instead of theswitch 1]. to con'iplete the primary circuit and the bell-ringingcircuitsimultaneously.

I am aware that changes in the construction, arrangement, andcombination of the several parts oi my device can be made andsubstituted for those herein shown and described .VitllOU t i the least.dcpartii'ig' from the nature and en pie of my iniventnin.

.liaving thus itescribm the invention, what claimed as new, and desiredto be secured by Letters Patent, is--- The combination with a main linecircuit of high-voltage strength, of a resistance-oar across said.maiudine circuit, fuses interposed between the ends oi saidresistance-bar and said nmiudiue circuit, a belt-ringing circuit havingone end connected. to one end oi said resistancc-bnr, an a nstable clampslidingl) mounted on said rc. stance-bar. a coiled Wire connecting saidclamp to a bunting-post to which the other leg of said bell-ringingcircuit is connected, means for locking said.

clamp in position on said bar and a switch for making and breaking saidderived circuit; substantially as described.

in testimony whereof ll hercul'ito ailix my iature, in the presence oitwo WitlliSSOS,

this 17th da). oi" iovcinbcl'. W05.

Glfltiliitdi ii. MoIXJNNlEIJJ.

\ itncsses:

i ii. Conmmmu, Unonen Baunwnnn.

